A krypton-xenon refining device

Abstract

The present application relates to rare gas separation and purification equipment technical field, and relates to a kind of krypton-xenon fine extraction device, including mounting plate, including raw material gas pretreatment unit, adaptive concentration system, rectification purification unit, product gas collection unit, the adaptive concentration system includes concentration tower and variable-angle elastic gas-liquid distributor, the concentration tower adopts variable-diameter tower body structure, including integrally arranged tower body upper section and tower body lower section, several layers of tray are arranged in the tower body of the concentration tower along the axial direction interval, the tray adopts sieve hole structure, a set of variable-angle elastic gas-liquid distributor is correspondingly provided above each layer of tray, the variable-angle elastic gas-liquid distributor includes stepper motor, rotatable flow guide pipe, titanium alloy elastic sieve plate and spring support assembly, effectively solve the distribution uniformity of gas-liquid two-phase in concentration tower in prior art, prone to channeling, deflection phenomenon, lead to mass transfer efficiency is low, influence krypton-xenon concentration effect problem.

Description

Technical Field

[0001] This invention relates to the field of rare gas separation and purification equipment, and in particular to a krypton-xenon refining device. Background Technology

[0002] Krypton (Kr) and xenon (Xe), as rare gases, possess excellent properties such as chemical stability, low thermal conductivity, and high luminous efficiency, and are widely used in high-end fields such as electric light sources, semiconductor manufacturing, medical imaging, and aerospace. However, the abundance of krypton and xenon in the air is extremely low (krypton is approximately 1.14 × 10⁻⁶). -4 Xenon is approximately 8.7 × 10⁻⁶. -6 It is often mixed with nitrogen, oxygen, argon and trace amounts of moisture, carbon oxides and other impurities in the raw material gas, making its separation and purification extremely difficult.

[0003] Currently, the commonly used industrial krypton-xenon refining process is mainly based on cryogenic distillation, which separates krypton-xenon from other gases through multiple concentrations and distillations. However, existing equipment has the following technical shortcomings in actual operation:

[0004] Insufficient gas-liquid contact within the concentration tower, coupled with the use of fixed-structure trays or distributors in traditional concentration towers, results in poor uniformity of gas-liquid phase distribution within the tower. This can lead to channeling and flow deviation, resulting in low mass transfer efficiency and negatively impacting the concentration effect of krypton and xenon. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a krypton-xenon refining device that effectively solves the problem that the gas-liquid two-phase distribution in the concentration tower is poor, and channeling and flow deviation are prone to occur, resulting in low mass transfer efficiency and affecting the concentration effect of krypton-xenon.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A krypton-xenon refining device includes a feed gas pretreatment unit, an adaptive concentration system, a distillation and purification unit, and a product gas collection unit. The adaptive concentration system includes a concentration tower and a variable-angle elastic gas-liquid distributor. The concentration tower adopts a variable-diameter tower structure, including an integrally formed upper tower section and a lower tower section. Several layers of trays are arranged axially at intervals inside the concentration tower. The trays adopt a sieve structure. A set of variable-angle elastic gas-liquid distributors is correspondingly arranged above each layer of trays. The variable-angle elastic gas-liquid distributor includes a stepper motor, a rotatable guide tube, a titanium alloy elastic sieve plate, and a spring support assembly.

[0008] Preferably, a stepper motor is installed on the concentration tower. The output end of the stepper motor is equipped with a rotating rod that is rotatably and sealed to the inner wall of the concentration tower. One end of the rotating rod is fixedly connected to a driving bevel gear, which meshes with a driven bevel gear. The driven bevel gear is fixedly connected to an internal rotating column that is rotatably connected to the tower plate. The upper end of the tower plate is provided with a mounting hole plate that is fixedly connected to the inner wall of the concentration tower. A titanium alloy elastic screen plate is slidably connected inside the mounting hole plate. The screen holes in the titanium alloy elastic screen plate are arranged in a regular hexagonal array. The regular hexagonal structure allows the liquid to form a more uniform distribution on the titanium alloy elastic screen plate. The titanium alloy elastic screen plate is connected to the mounting hole plate through a spring support assembly. The spring support assembly includes several sets of compression springs evenly distributed along the edge of the titanium alloy elastic screen plate. Several sets of fixing plates connected to the compression springs are correspondingly installed on the mounting hole plate.

[0009] Preferably, an inner groove column is fixedly installed on the upper end of the tower plate and sleeved with the inner swivel column. A rectangular frame is provided at the upper end of the inner groove column and rotatably connected to the inner swivel column. The two ends of the rectangular frame are respectively installed with the rotatable guide pipe and the ball column. A pressure plate is rotatably installed on the rotatable guide pipe. A pin corresponding to the inner groove column is provided at the lower end of the pressure plate.

[0010] Preferably, the tilt angle of the rotatable guide tube and the ball column can continuously swing within the range of 0°-30°, and the inner wall of the rotatable guide tube is integrally formed with a spiral guide rib along the axial direction.

[0011] Preferably, the raw gas pretreatment unit includes a dust filter, a dehydration dryer, and a deoxygenation tower. The dust filter is a high-efficiency air filter, the dehydration dryer is filled with molecular sieve desiccant, the deoxygenation tower is filled with palladium catalyst, and the deoxygenation tower is connected to the bottom of the concentration tower via an installation pipeline.

[0012] Preferably, the distillation and purification unit includes a main distillation column, a reboiler, and a condenser. The upper end of the main distillation column is connected to the concentration column via a gas phase pipeline. The main distillation column is equipped with a structured packing layer. The reboiler is heated by steam. The lower end of the concentration column is connected to the main distillation column via a pipeline, and a cryogenic shielded pump is installed on the pipeline.

[0013] Preferably, the condenser is installed at the upper end of the main distillation column, and the gas phase inlet of the condenser is connected to the upper end of the main distillation column. The liquid phase outlet of the condenser is equipped with a main liquid collector, and a cryogenic special diverter tee is installed on the main liquid collector. The outlet one of the cryogenic special diverter tee is located at the upper end of the main distillation column, and the outlet two of the cryogenic special diverter tee is equipped with a main pipe. The internal hollow column includes a lower hollow column and an upper hollow column. The upper hollow column and the lower hollow column are integrally set by setting a fixed column in the middle. The end of the main pipe is respectively equipped with a branch pipe connected to the upper hollow column and the lower hollow column. A variable frequency cryogenic centrifugal pump and an electromagnetic flow valve are installed on the main pipe.

[0014] Preferably, the product collection unit includes a first collection pipe and a second collection pipe installed at the upper and lower ends of the main distillation column, respectively. The first collection pipe is located at the top of the main distillation column to collect high-purity krypton gas, and the second collection pipe is located at the bottom of the main distillation column to collect high-purity xenon gas.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting a rotatable guide pipe, the tilt angle of the rotatable guide pipe can be continuously adjusted within the range of 0°-30° during rotation. During the undulating process, the rotatable guide pipe can spray the titanium alloy elastic screen plate within different radius ranges, so that the flowing reflux liquid forms a spiral flow, increasing the contact area between the liquid and the titanium alloy elastic screen plate, while enhancing the liquid dispersion and preventing the liquid from falling in streams. When the titanium alloy elastic screen plate is subjected to pressure, the spring support component applies pressure, thereby realizing the titanium alloy elastic screen plate to generate micro-amplitude vibration. The screen holes distributed in a regular hexagonal array inside the titanium alloy elastic screen plate, combined with the vibration of the titanium alloy elastic screen plate, further uniformly disperse the reflux liquid, forming a uniform liquid film covering the tower plate, improving the uniformity of the distribution of gas and liquid phases in the concentration tower. Attached Figure Description

[0016] Figure 1 This is a modeling diagram of a krypton-xenon refining device according to the present invention;

[0017] Figure 2 This is an isometric view of a krypton-xenon refining device according to the present invention;

[0018] Figure 3 This is a front cross-sectional view of a krypton-xenon refining apparatus according to the present invention;

[0019] Figure 4 This is a schematic diagram of the mounting plate of a krypton-xenon refining device according to the present invention;

[0020] Figure 5 A krypton-xenon refining apparatus of the present invention Figure 4 A magnified view of a portion of region A;

[0021] Figure 6This is a schematic diagram of the structure of the tower plate of a krypton-xenon refining device according to the present invention;

[0022] Figure 7 This is a schematic diagram of the rectangular frame of a krypton-xenon refining device according to the present invention;

[0023] Figure 8 This is a schematic diagram of the structure of a titanium alloy elastic sieve plate in a krypton-xenon refining device according to the present invention;

[0024] Figure 9 This is a schematic diagram of the main distillation column of a krypton-xenon refining apparatus according to the present invention;

[0025] Figure 10 This is a schematic diagram of the spiral guide rib of a krypton-xenon refining device according to the present invention;

[0026] In the diagram: 1. Dust filter; 2. Dehydration dryer; 3. Deoxygenation tower; 4. Lower section of tower; 5. Upper section of tower; 6. Main distillation tower; 7. Condenser; 8. Installation piping; 9. Cryogenic shielded pump; 10. Gas phase pipeline; 11. Motor; 12. Rotary rod; 13. Driven bevel gear; 14. Driven bevel gear; 15. Lower empty column; 16. Mounting orifice plate; 17. Tower plate; 18. Titanium alloy elastic sieve plate; 19. Variable frequency cryogenic centrifugal pump; 20. Electric... Magnetic flow valve, 21. Main pipe, 22. Branch pipe, 23. Upper hollow column, 24. Pressure plate, 25. Pin rod, 26. Rotatable guide tube, 27. Ball column, 28. Rectangular frame, 29. Inner groove column, 30. Fixing plate, 31. Compression spring, 32. First collection pipe, 33. Second collection pipe, 34. Structured packing layer, 35. Reboiler, 36. Fixing column, 37. Main manifold, 38. Low temperature special diverter tee, 39. Spiral guide rib. Detailed Implementation

[0027] like Figure 1-10 As shown, a krypton-xenon refining device includes a feed gas pretreatment unit, an adaptive concentration system, a distillation purification unit, and a product gas collection unit. The adaptive concentration system includes a concentration tower and a variable-angle elastic gas-liquid distributor. The concentration tower adopts a variable-diameter tower structure, including an integrally formed upper tower section 5 and a lower tower section 4. Several layers of trays 17 are arranged axially at intervals inside the concentration tower. The trays 17 adopt a sieve structure. A set of variable-angle elastic gas-liquid distributors is correspondingly arranged above each layer of trays 17. The variable-angle elastic gas-liquid distributor includes a stepper motor 11, a rotatable guide tube 26, a titanium alloy elastic sieve plate 18, and a spring support assembly.

[0028] In operation, the raw gas enters the raw gas pretreatment unit to remove solid particulate impurities, moisture, and oxygen. The pretreated raw gas enters from the lower section 4 of the concentration tower. Due to the larger inner diameter of the lower section 4, the gas flow rate decreases, providing sufficient time for adequate gas-liquid contact. The gas flows axially upwards within the concentration tower, passing sequentially through several axially spaced trays 17. Simultaneously, the reflux liquid from the distillation and purification unit is transported through a pipeline system to a rotatable guide tube 26 within the concentration tower. A stepper motor 11 provides the driving force, and the rotatable guide tube 26 tilts at an angle of 0° during rotation. The rotatable guide pipe 26, which can be continuously adjusted within a 30° range, can spray the titanium alloy elastic sieve plate 18 within different radii during the undulating process, increasing the contact area between the liquid and the titanium alloy elastic sieve plate 18, while enhancing the liquid dispersion and preventing the liquid from falling in streams. When the titanium alloy elastic sieve plate 18 is subjected to pressure, the spring support component applies pressure, thereby causing the titanium alloy elastic sieve plate 18 to vibrate slightly. The sieve holes arranged in a regular hexagonal array inside the titanium alloy elastic sieve plate 18, combined with the vibration of the titanium alloy elastic sieve plate 18, further disperse the reflux liquid evenly, forming a uniform liquid film covering the tower plate 17.

[0029] A stepper motor 11 is installed on the concentration tower. A rotating rod 12, which is rotatably and sealed to the inner wall of the concentration tower, is installed at the output end of the stepper motor 11. A driving bevel gear 14 is fixedly connected to one end of the rotating rod 12. The driving bevel gear 14 meshes with a driven bevel gear 13. An inner hollow rotating column, which is rotatably connected to the tower plate 17, is fixedly connected to the upper end of the tower plate 17. An installation hole plate 16, which is fixedly connected to the inner wall of the concentration tower, is provided. A titanium alloy elastic screen plate 18 is slidably connected in the installation hole plate 16. The screen holes in the titanium alloy elastic screen plate 18 are arranged in a regular hexagonal array. The regular hexagonal structure allows the liquid to form a more uniform distribution on the titanium alloy elastic screen plate 18. The titanium alloy elastic screen plate 18 is connected to the installation hole plate 16 through a spring support assembly. The spring support assembly includes several sets of compression springs 31 evenly distributed along the edge of the titanium alloy elastic screen plate 18. Several sets of fixing plates 30, which are connected to the compression springs 31, are correspondingly installed on the installation hole plate 16.

[0030] The upper end of the tower plate 17 is fixedly installed with an inner groove column 29 that is sleeved and connected to the inner idling column. The upper end of the inner groove column 29 is provided with a rectangular frame 28 that is rotatably connected to the inner idling column. The two ends of the rectangular frame 28 are respectively installed with the rotatable guide pipe 26 and the ball column 27. A pressure plate 24 is rotatably installed on the rotatable guide pipe 26. The lower end of the pressure plate 24 is provided with a pin 25 corresponding to the inner groove column 29.

[0031] The tilt angle of the rotatable guide tube 26 and the ball column 27 can be continuously rotated within the range of 0°-30°. The inner wall of the rotatable guide tube 26 is integrally formed with a spiral guide rib 39 along the axial direction.

[0032] like Figure 3-8 As shown, stepper motor 11 starts, and its output drives rotating rod 12 to rotate. The driving bevel gear 14 at one end of rotating rod 12 meshes with and drives driven bevel gear 13 to rotate. Driven bevel gear 13 drives the inner hollow rotating column, which is fixedly connected to it, to rotate. The rectangular frame 28 connected to the upper end of the inner hollow rotating column rotates circumferentially with the inner hollow rotating column. The rotatable guide tubes 26 and ball columns 27 at both ends of the rectangular frame 28 rotate synchronously. During the circumferential rotation, the rotatable guide tube 26 drives pin 25 to rotate along the inner groove column 29 via pressure plate 24. Because the inner groove column 29 has a wavy groove, one end of pin 25 is equipped with a ball that slides against the inner wall of the wavy groove to prevent pin 25 from disengaging from the inner groove column 29. The wavy groove, in conjunction with pin 25, drives pressure plate 24 to move up and down, thereby achieving simultaneous circumferential rotation and up-and-down deflection of rotatable guide tube 26 and ball columns 27. During rotation, the tilt angle of rotatable guide tube 26 is between 0° and... The rotatable guide tube 26, continuously adjustable within a 30° range, can spray the titanium alloy elastic sieve plate 18 within different radius ranges during its undulating motion. Combined with the 5mm high spiral guide ribs 39 integrally formed along the axial direction on the inner wall of the rotatable guide tube 26, the flowing reflux liquid forms a spiral flow, increasing the contact area between the liquid and the titanium alloy elastic sieve plate 18, while simultaneously enhancing liquid dispersion and preventing the liquid from falling in streams. After being sprayed from the rotatable guide tube 26, the reflux liquid falls onto the titanium alloy elastic sieve plate 18 at the upper end of the tower plate 17. Simultaneously, the tilt angle of the ball column 27 during rotation is 0°- The titanium alloy elastic sieve plate 18 can be intermittently squeezed within a 30° range. The titanium alloy elastic sieve plate 18 slides up and down along the inner wall of the mounting perforated plate 16. When subjected to pressure, the titanium alloy elastic sieve plate 18 will press the compression spring 31, thereby causing the titanium alloy elastic sieve plate 18 to vibrate slightly. The sieve holes arranged in a regular hexagonal array inside the titanium alloy elastic sieve plate 18, combined with the vibration of the titanium alloy elastic sieve plate 18, further disperse the reflux liquid evenly, forming a uniform liquid film covering the tower plate 17.

[0033] The raw gas pretreatment unit includes a dust filter 1, a dehydration dryer 2, and a deoxygenation tower 3. The dust filter 1 is a high-efficiency air filter. The dehydration dryer 2 is filled with molecular sieve desiccant. The deoxygenation tower 3 is filled with palladium catalyst. The deoxygenation tower 3 is connected to the bottom of the concentration tower through an installation pipe 8.

[0034] like Figure 2 and 3As shown, the raw gas enters the high-efficiency air filter, which uses its high-precision filtration capability to remove solid particulate impurities from the raw gas, preventing scaling or blockage in subsequent equipment. The dust-removed raw gas flows into the dehydration dryer 2. The molecular sieve desiccant filled in the dryer removes moisture from the raw gas through physical adsorption, preventing water from freezing during subsequent low-temperature concentration and distillation processes, which would affect pipeline flow and separation efficiency. The dehydrated raw gas enters the deoxygenation tower 3. The palladium catalyst packed in the tower reacts with the preset hydrogen in the raw gas at a suitable temperature, usually 300-350℃, within the active temperature range of palladium catalyst, to produce water. The generated water enters the subsequent drying stage with the airflow, ultimately reducing the oxygen content in the raw gas to an extremely low level, preventing oxygen from mixing with krypton and xenon and affecting product purity. It also prevents adverse reactions between oxygen and equipment materials at low temperatures. The pre-treated raw gas is then transported through pipelines to the bottom of the concentration tower of the adaptive concentration system.

[0035] The distillation and purification unit includes a main distillation column 6, a reboiler 35, and a condenser 7. The main distillation column 6 is connected to the upper end of the concentration column via a gas phase pipeline 10. The main distillation column 6 is equipped with a structured packing layer 34. The reboiler 35 is heated by steam. The lower end of the concentration column is connected to the main distillation column 6 via a pipeline, and a cryogenic shielded pump 9 is installed on the pipeline.

[0036] like Figure 3 and 9 As shown, the concentrate in the bottom of the concentration tower is transported to the main distillation tower 6 through a pipeline. The cryogenic shielded pump 9 installed on the pipeline provides power for the transport of the concentrate, ensuring its stable flow into the main distillation tower 6. After preliminary concentration in the concentration tower, the crude krypton-xenon mixture discharged from the top of the tower is transported to the main distillation tower 6 through the gas phase pipeline 10. The reboiler 35 at the bottom of the main distillation tower 6 is heated by steam, causing the liquid in the bottom of the main distillation tower 6 to partially vaporize and form an upward airflow.

[0037] The condenser 7 is installed at the upper end of the main distillation column 6, and the gas phase inlet of the condenser 7 is connected to the upper end of the main distillation column 6. The liquid phase outlet of the condenser 7 is equipped with a main liquid collection pipe 37. A low-temperature dedicated diversion tee 38 is installed on the main liquid collection pipe 37. One outlet of the low-temperature dedicated diversion tee 38 is located at the upper end of the main distillation column 6. A main pipe 21 is installed at the other outlet of the low-temperature dedicated diversion tee 38. The internal empty column includes a lower empty column 15 and an upper empty column 23. The upper empty column 23 and the lower empty column 15 are integrally set by a fixed column 36. The end of the main pipe 21 is respectively equipped with a branch pipe 22 connected to the upper empty column 23 and the lower empty column 15. A variable frequency low-temperature centrifugal pump 19 and an electromagnetic flow valve 20 are installed on the main pipe 21.

[0038] like Figure 3 and 4As shown, the reflux liquid source is the liquid phase outlet of the condenser 7 at the top of the self-distillation column 6. After being collected by the main collection pipe 37, it is split through the low-temperature dedicated splitting tee 38. One path is transported through the main pipe 21, which is equipped with a variable frequency low-temperature centrifugal pump 19 and an electromagnetic flow valve 20. Two branch pipes 22 are provided at the end of the main pipe 21, which are respectively connected to the lower empty column 15 and the upper empty column 23. The fixed column 36 is used to form an integral structure of the upper empty column 23 and the lower empty column 15. The hollow parts of the upper empty column 23 and the lower empty column 15 are contained in the section of the rotatable guide pipe 26. The reflux liquid enters the rotatable guide pipe 26 through the hollow rotating column. The other path is transported to the concentration tower through the main pipe 21 and the branch pipes 22. The reflux liquid serves as a gas-liquid distributor. The variable frequency cryogenic centrifugal pump 19 provides power for the reflux liquid transport, ensuring that it overcomes the pressure inside the column and the resistance of the pipeline; the electromagnetic flow valve 20 precisely controls the total flow rate of the reflux liquid to adapt to the fluctuation requirements of the raw material gas composition; the condenser 7 at the top of the main distillation column 6 condenses the rising gas phase at the top of the column, forming a descending liquid flow; the structured packing layer 34 set in the main distillation column 6 provides a sufficient mass transfer interface for the gas and liquid phases; the rising gas flow and the descending liquid flow come into countercurrent contact in the structured packing layer 34; through the vaporization of the reboiler 35 and the condensation of the condenser 7, the deep separation of the krypton and xenon components is achieved; the low-boiling-point krypton is more concentrated in the gas phase and moves towards the top of the column; the high-boiling-point xenon is more concentrated in the liquid phase and moves towards the bottom of the column.

[0039] The product collection unit includes a first collection pipe 32 and a second collection pipe 33 installed at the upper and lower ends of the main distillation column 6, respectively. The first collection pipe 32 is set at the top of the main distillation column 6 to collect high-purity krypton gas, and the second collection pipe 33 is set at the bottom of the main distillation column 6 to collect high-purity xenon gas.

[0040] like Figure 3 and 9 As shown, the high-purity krypton gas enriched at the top of the main distillation column 6 enters the product collection unit through the first collection pipe 32 at the top of the main distillation column 6. After subsequent buffering and purity testing, it is stored or filled. The high-purity xenon gas enriched at the bottom of the main distillation column 6 enters the product collection unit through the second collection pipe 33 at the bottom of the main distillation column 6. After buffering and purity testing, it is collected.

[0041] The working process of this invention is as follows: The raw gas enters the high-efficiency air filter, which uses its high-precision filtration capability to remove solid particulate impurities from the raw gas, preventing scaling or blockage in subsequent equipment. The raw gas after dust removal flows into the dehydration dryer 2. The molecular sieve desiccant filled in the dryer removes moisture from the raw gas through physical adsorption, preventing water from freezing during subsequent low-temperature concentration and distillation processes, which would affect pipeline flow and separation efficiency. The dehydrated raw gas enters the deoxygenation tower 3. The palladium catalyst filled in the tower reacts with the preset hydrogen in the raw gas at a suitable temperature, usually 300-350℃, which is within the active temperature range of the palladium catalyst, to generate water. The generated water enters the subsequent drying stage with the airflow, ultimately reducing the oxygen content in the raw gas to an extremely low level, preventing oxygen from mixing with krypton and xenon and affecting product purity. At the same time, it prevents oxygen from reacting adversely with equipment materials at low temperatures. The pre-treated raw gas is then transported through pipelines to the bottom of the concentration tower of the adaptive concentration system.

[0042] The pretreated feed gas enters from the lower section 4 of the concentrator. Due to the larger inner diameter of the lower section 4, the gas velocity decreases, providing sufficient time for gas-liquid contact. The gas flows axially upward within the concentrator, passing sequentially through several axially spaced trays 17. Simultaneously, the reflux liquid generated by the distillation and purification unit is transported to the concentrator via a pipeline system. The reflux liquid originates from the liquid phase outlet of the condenser 7 at the top of the distillation column 6, is collected by the main collection pipe 37, and then splits through a cryogenic dedicated splitter tee 38, one of which... The reflux liquid is transported through the main pipe 21, which is equipped with a variable frequency cryogenic centrifugal pump 19 and an electromagnetic flow valve 20. Two branch pipes 22 are provided at the end of the main pipe 21, which are connected to the lower empty column 15 and the upper empty column 23 respectively. The fixed column 36 is used to integrate the upper empty column 23 and the lower empty column 15. The reflux liquid enters the rotatable guide pipe 26 through the inner hollow rotating column. The variable frequency cryogenic centrifugal pump 19 provides power for the reflux liquid transportation, ensuring that it overcomes the pressure inside the tower and the resistance of the pipeline. The electromagnetic flow valve 20 precisely controls the total flow rate of the reflux liquid to adapt to the fluctuation requirements of the raw material gas composition.

[0043] Stepper motor 11 starts, and its output drives rotor 12 to rotate. The driving bevel gear 14 at one end of rotor 12 meshes and drives driven bevel gear 13 to rotate. Driven bevel gear 13 drives the inner hollow rotating column, which is fixedly connected to it, to rotate. The rectangular frame 28 connected to the upper end of the inner hollow rotating column rotates circumferentially with the inner hollow rotating column. The rotatable guide tubes 26 and ball columns 27 at both ends of the rectangular frame 28 rotate synchronously. During the circumferential rotation, the rotatable guide tubes 26 drive the pin 25 along the inner groove column 29 via the pressure plate 24. As the inner column 29 rotates, the corrugated groove, in conjunction with the pin 25, drives the pressure plate 24 to move up and down. This causes the rotatable guide tube 26 and the ball column 27 to rotate in a circular motion while undulating up and down. During the rotation, the tilt angle of the rotatable guide tube 26 can be continuously adjusted within the range of 0°-30°. During the undulation, the rotatable guide tube 26 can spray the titanium alloy elastic screen plate 18 within different radius ranges. In conjunction with the 5mm high spiral guide rib 39 integrally formed along the axial direction on the inner wall of the rotatable guide tube 26, the flowing return liquid forms a spiral flow, increasing the contact area between the liquid and the titanium alloy elastic screen plate 18, while enhancing the liquid dispersion and preventing the liquid from falling in streams.

[0044] After the reflux liquid is sprayed out from the rotatable guide pipe 26, it falls onto the titanium alloy elastic sieve plate 18 at the upper end of the tray 17. At the same time, the tilt angle of the ball column 27 is continuously adjusted within the range of 0°-30° during rotation, which can intermittently squeeze the titanium alloy elastic sieve plate 18. The titanium alloy elastic sieve plate 18 slides up and down along the inner wall of the mounting perforated plate 16. When the titanium alloy elastic sieve plate 18 is under pressure, it will press the compression spring 31, thereby causing the titanium alloy elastic sieve plate 18 to vibrate slightly. The sieve holes distributed in a regular hexagonal array inside the titanium alloy elastic sieve plate 18, combined with the vibration of the titanium alloy elastic sieve plate 18, further disperse the reflux liquid evenly, forming a uniform liquid film covering the tray 17.

[0045] The rising feed gas and the descending reflux liquid come into countercurrent contact between the tray 17 and the titanium alloy elastic sieve plate 18. Through mass transfer, the krypton-xenon components with higher boiling points in the feed gas are absorbed by the reflux liquid and gradually enriched in the liquid phase. As the gas flows upward to the upper section 5 of the tower, the gas velocity increases, enhancing the turbulence of the gas and liquid phases and further improving the mass transfer efficiency. Finally, the krypton-xenon-rich liquid phase gathers in the bottom of the tower to form a concentrated liquid.

[0046] The concentrate in the bottom of the concentration tower is transported to the main distillation tower 6 through a pipeline. The cryogenic shielded pump 9 installed on the pipeline provides power for the transport of the concentrate, ensuring its stable flow into the main distillation tower 6. After preliminary concentration in the concentration tower, the crude krypton-xenon mixture discharged from the top of the tower is transported to the main distillation tower 6 through the gas phase pipeline 10. The reboiler 35 at the bottom of the main distillation tower 6 is heated by steam, causing the liquid in the bottom of the main distillation tower 6 to partially vaporize and form an upward airflow.

[0047] The condenser 7 at the top of the main distillation column 6 condenses the rising gas phase at the top of the column, forming a descending liquid flow.

[0048] The structured packing layer 34 installed in the main distillation column 6 provides a sufficient mass transfer interface for the gas and liquid phases. The rising gas flow and the descending liquid flow come into countercurrent contact in the structured packing layer 34. Through the vaporization of the reboiler 35 and the condensation of the condenser 7, the krypton and xenon components are deeply separated. The low-boiling-point krypton is more concentrated in the gas phase and moves towards the top of the column, while the high-boiling-point xenon is more concentrated in the liquid phase and moves towards the bottom of the column.

[0049] The condensate produced by condenser 7 is collected by the main collection pipe 37 and then divided into two paths by the low-temperature dedicated diversion tee 38. One path flows directly back to the upper end of the main distillation column 6 to participate in the distillation process in the column; the other path is transported to the concentration column through the main pipe 21 and the branch pipe 22 as the reflux liquid of the gas-liquid distributor, forming a closed loop of "concentration-distillation-reflux".

[0050] The high-purity krypton gas enriched at the top of the main distillation column 6 enters the product collection unit through the first collection pipe 32 at the top of the main distillation column 6. After subsequent buffering, purity testing and other processes, it is stored or filled.

[0051] The high-purity xenon gas enriched in the bottom of the main distillation column 6 enters the product collection unit through the second collection pipe 33 in the bottom of the main distillation column 6. After buffering and purity testing, the collection is completed.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A krypton-xenon refining device, characterized in that: The system includes a raw gas pretreatment unit, an adaptive concentration system, a distillation and purification unit, and a product gas collection unit. The adaptive concentration system includes a concentration tower and a variable-angle elastic gas-liquid distributor. The concentration tower adopts a variable-diameter tower structure, including an integrally formed upper tower section (5) and a lower tower section (4). Several layers of trays (17) are arranged axially at intervals inside the concentration tower. The trays (17) adopt a sieve structure. A set of variable-angle elastic gas-liquid distributors is correspondingly arranged above each layer of trays (17). The variable-angle elastic gas-liquid distributor includes a rotatable guide tube (26). The thickening tower is equipped with a titanium alloy elastic screen plate (18) and a spring support assembly. A stepper motor (11) is installed on the thickening tower. A rotating rod (12) is installed at the output end of the stepper motor (11) and is rotatably connected to the inner wall of the thickening tower. One end of the rotating rod (12) is fixedly connected to a driving bevel gear (14). The driving bevel gear (14) meshes with a driven bevel gear (13). The driven bevel gear (13) is fixedly connected to an inner hollow rotating column that is rotatably connected to the tower plate (17). The upper end of the tower plate (17) is provided with a mounting hole plate (16) that is fixedly connected to the inner wall of the thickening tower. A titanium alloy elastic screen plate (18) is slidably connected inside the mounting orifice plate (16). The screen holes in the titanium alloy elastic screen plate (18) are arranged in a regular hexagonal array. The regular hexagonal structure allows the liquid to form a more uniform distribution on the titanium alloy elastic screen plate (18). The titanium alloy elastic screen plate (18) is connected to the mounting orifice plate (16) through a spring support assembly. The spring support assembly includes several sets of compression springs (31) evenly distributed along the edge of the titanium alloy elastic screen plate (18). Several sets of fixing plates (31) connected to the compression springs (31) are correspondingly installed on the mounting orifice plate (16). 0), the upper end of the tower plate (17) is fixedly installed with an inner groove column (29) that is sleeved and connected to the inner swivel column. The upper end of the inner groove column (29) is provided with a rectangular frame (28) that is rotatably connected to the inner swivel column. The two ends of the rectangular frame (28) are respectively installed with the rotatable guide tube (26) and the ball column (27). The rotatable guide tube (26) is rotatably installed with a pressure plate (24). The lower end of the pressure plate (24) is provided with a pin (25) corresponding to the inner groove column (29). The tilt angle of the rotatable guide tube (26) and the ball column (27) can be continuously swung within the range of 0°-30°. The inner wall of the rotatable guide tube (26) is integrally formed with a spiral guide rib (39) along the axial direction.

2. The krypton-xenon refining apparatus according to claim 1, characterized in that: The raw gas pretreatment unit includes a dust filter (1), a dehydration dryer (2), and a deoxygenation tower (3). The dust filter (1) is a high-efficiency air filter. The dehydration dryer (2) is filled with molecular sieve desiccant. The deoxygenation tower (3) is filled with palladium catalyst. The deoxygenation tower (3) is connected to the bottom of the concentration tower through an installation pipe (8).

3. The krypton-xenon refining apparatus according to claim 2, characterized in that: The distillation and purification unit includes a main distillation column (6), a reboiler (35) and a condenser (7). The main distillation column (6) is connected to the upper end of the concentration column via a gas phase pipeline (10). A structured packing layer (34) is provided inside the main distillation column (6). The reboiler (35) is heated by steam. The lower end of the concentration column is connected to the main distillation column (6) via a pipeline. A low-temperature shielded pump (9) is installed on the pipeline.

4. The krypton-xenon refining apparatus according to claim 3, characterized in that: The condenser (7) is installed at the upper end of the main distillation column (6), and the gas phase inlet of the condenser (7) is connected to the upper end of the main distillation column (6). The liquid phase outlet of the condenser (7) is equipped with a total liquid collection pipe (37). A low-temperature special diversion tee (38) is installed on the total liquid collection pipe (37). The outlet one of the low-temperature special diversion tee (38) is located at the upper end of the main distillation column (6). The outlet two of the low-temperature special diversion tee (38) is equipped with a main pipe (21). The internal empty column includes a lower empty column (15) and an upper empty column (23). The upper empty column (23) and the lower empty column (15) are integrated by setting a fixed column (36) in the middle. The end of the main pipe (21) is respectively equipped with a branch pipe (22) connected to the upper empty column (23) and the lower empty column (15). A variable frequency low-temperature centrifugal pump (19) and an electromagnetic flow valve (20) are installed on the main pipe (21).

5. The krypton-xenon refining apparatus according to claim 4, characterized in that: The product gas collection unit includes a first collection pipe (32) and a second collection pipe (33) installed at the upper and lower ends of the main distillation column (6). The first collection pipe (32) is set at the top of the main distillation column (6) to collect high-purity krypton gas, and the second collection pipe (33) is set at the bottom of the main distillation column (6) to collect high-purity xenon gas.

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